linux-kernel - Re: [git pull] stackprotector re-enabling patches

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Message-ID: <20090103224408.GC17047@elte.hu>
Date:	Sat, 3 Jan 2009 23:44:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [git pull] stackprotector re-enabling patches


* Arjan van de Ven <arjan@...radead.org> wrote:

> On Sat, 3 Jan 2009 13:55:13 -0800
> Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > On Sat, 3 Jan 2009 22:43:53 +0100
> > Ingo Molnar <mingo@...e.hu> wrote:
> > >  
> > > diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
> > > index 10d6cc3..28f1114 100644
> > > --- a/arch/x86/Kconfig.debug
> > > +++ b/arch/x86/Kconfig.debug
> > > @@ -117,6 +117,7 @@ config DEBUG_RODATA
> > >  config DEBUG_RODATA_TEST
> > >  	bool "Testcase for the DEBUG_RODATA feature"
> > >  	depends on DEBUG_RODATA
> > > +	default y
> > >  	help
> > >  	  This option enables a testcase for the DEBUG_RODATA
> > >  	  feature as well as for the change_page_attr()
> > 
> > I think this chunk isn't meant to be there...
> 
> actually never mind.
> it does make sense in general (in fact, I'd be tempted to remove the
> KConfig for this one and just always do the check)

yes. The reason why this change went into the stackprotector tree was 
because it was the same pattern: security feature breaking because it 
didnt have efficient self-tests - while attackers obviously never notified 
us that it's broken.

DEBUG_RODATA had similar bugs: it didnt work correctly in some cases and 
nothing really tested that so we had long latency of bugs. So i turned on 
that self-test too. [and that did catch some bugs, which you fixed, many 
moons ago ;-) ]

	Ingo
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